Instrument for disassembling a bipolar hip prosthesis

US5405404A · kind A · utility

Assignee

• Intermedics Orthopedics, Inc. · US

Inventors

• Kenneth J. Gardner · Lompoc, US
• Adriana de la Barcena · Austin, US
• Steven L. van der Meulen · Cedar Park, US
• Donald W. Dye · Pflugerville, US
• Amber E. Okoye · Hialeah, US
• Mark Arlitt · Austin, US

Key dates

• Filing date: Oct 7, 1993
• Grant date: Apr 11, 1995
• Expiry date: Oct 7, 2013

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2002/4641
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An apparatus for disassembling a head and acetabular component of a bipolar orthopedic hip prosthesis. The head includes a female taper configured for engaging a corresponding male taper of a femoral component of a hip prosthesis. The acetabular component includes a cavity in which the head is elastically constrained. The apparatus includes a rod having a male taper at one end thereof sized and configured to be received in taper locking engagement in the female taper of the head of the bipolar prosthesis. The rod has external threads that engage internal threads of a sleeve surrounding the rod. The sleeve includes a thrust surface at one end that engages the acetabular component as the sleeve is rotated relative to the rod. The sleeve causes the acetabular component to be pressed off of the head while the head remains taper locked to the rod. Continued rotation of the sleeve causes the head to be pressed off of the taper of the rod. A handle attached to the rod facilitates gripping the rod and preventing its rotation while the sleeve is being rotated.